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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Numerator:    
Net income $ 74,177 $ 55,562
Denominator (shares in 000's):    
Basic weighted average shares outstanding (in shares) 59,642,000 60,184,000
Effect of dilutive securities - stock options and awards (in shares) 657,000 615,000
Diluted weighted average shares outstanding (in shares) 60,299,000 60,799,000
Basic earnings per share (in dollars per share) $ 1.24 $ 0.92
Diluted earnings per share (in dollars per share) $ 1.23 $ 0.91
Anti-dilutive shares excluded from the computation of diluted earnings per share 89,592 655,764